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Fair Value Measurements Table - Fair Value of Financial Assets and Liabilities (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Price Risk Derivative Assets, at Fair Value	$ 603	$ 321
Other Assets, Fair Value Disclosure	28	21
Assets, Fair Value Disclosure	631	342
Interest Rate Derivative Liabilities, at Fair Value	(97)	(219)
Price Risk Derivative Liabilities, at Fair Value	(877)	(341)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(974)	(560)
Level 1
Price Risk Derivative Assets, at Fair Value	554	277
Other Assets, Fair Value Disclosure	18	14
Assets, Fair Value Disclosure	572	291
Interest Rate Derivative Liabilities, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	(839)	(303)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(839)	(303)
Level 2
Price Risk Derivative Assets, at Fair Value	49	44
Other Assets, Fair Value Disclosure	10	7
Assets, Fair Value Disclosure	59	51
Interest Rate Derivative Liabilities, at Fair Value	(97)	(219)
Price Risk Derivative Liabilities, at Fair Value	(38)	(38)
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(135)	(257)
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member]
Price Risk Derivative Assets, at Fair Value	48	11
Price Risk Derivative Liabilities, at Fair Value	(89)	(24)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]
Price Risk Derivative Assets, at Fair Value	1	13
Price Risk Derivative Liabilities, at Fair Value	(1)	(15)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]
Price Risk Derivative Assets, at Fair Value	25	70
Price Risk Derivative Liabilities, at Fair Value	(26)	(57)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member]
Price Risk Derivative Assets, at Fair Value	12	8
Price Risk Derivative Liabilities, at Fair Value	(7)	2
Commodity Derivatives - Natural Gas [Member] | Level 1 | Basis Swaps IFERC/NYMEX [Member]
Price Risk Derivative Assets, at Fair Value	48	11
Price Risk Derivative Liabilities, at Fair Value	(89)	(24)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Swing Swaps IFERC [Member]
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	0	(1)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Fixed Swaps/Futures [Member]
Price Risk Derivative Assets, at Fair Value	25	70
Price Risk Derivative Liabilities, at Fair Value	26	(57)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Forward Physical Swaps [Member]
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	0	0
Commodity Derivatives - Natural Gas [Member] | Level 2 | Basis Swaps IFERC/NYMEX [Member]
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	0	0
Commodity Derivatives - Natural Gas [Member] | Level 2 | Swing Swaps IFERC [Member]
Price Risk Derivative Assets, at Fair Value	1	13
Price Risk Derivative Liabilities, at Fair Value	(1)	(14)
Commodity Derivatives - Natural Gas [Member] | Level 2 | Fixed Swaps/Futures [Member]
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	0	0
Commodity Derivatives - Natural Gas [Member] | Level 2 | Forward Physical Swaps [Member]
Price Risk Derivative Assets, at Fair Value	12	8
Price Risk Derivative Liabilities, at Fair Value	7	2
Commodity Derivatives - Refined Products [Member] | Future [Member]
Price Risk Derivative Assets, at Fair Value	4	1
Price Risk Derivative Liabilities, at Fair Value	(10)	(28)
Commodity Derivatives - Refined Products [Member] | Level 1 | Future [Member]
Price Risk Derivative Assets, at Fair Value	4	1
Price Risk Derivative Liabilities, at Fair Value	(10)	(28)
Commodity Derivatives - Refined Products [Member] | Level 2 | Future [Member]
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	0	0
Commodity Derivatives - Crude [Member] | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value		2
Price Risk Derivative Liabilities, at Fair Value	(191)	(6)
Commodity Derivatives - Crude [Member] | Future [Member]
Price Risk Derivative Assets, at Fair Value		2
Price Risk Derivative Liabilities, at Fair Value		(1)
Commodity Derivatives - Crude [Member] | Level 1 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value		2
Price Risk Derivative Liabilities, at Fair Value	(191)	(6)
Commodity Derivatives - Crude [Member] | Level 1 | Future [Member]
Price Risk Derivative Assets, at Fair Value		2
Price Risk Derivative Liabilities, at Fair Value		(1)
Commodity Derivatives - Crude [Member] | Level 2 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value		0
Price Risk Derivative Liabilities, at Fair Value	0	0
Commodity Derivatives - Crude [Member] | Level 2 | Future [Member]
Price Risk Derivative Assets, at Fair Value		0
Price Risk Derivative Liabilities, at Fair Value		0
Commodity Derivatives - Power [Member] | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	36	23
Price Risk Derivative Liabilities, at Fair Value	(30)	(22)
Commodity Derivatives - Power [Member] | Fixed Swaps/Futures [Member]
Price Risk Derivative Liabilities, at Fair Value	(1)
Commodity Derivatives - Power [Member] | Options - Puts [Member]
Price Risk Derivative Assets, at Fair Value	1
Commodity Derivatives - Power [Member] | Level 1 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	0	0
Commodity Derivatives - Power [Member] | Level 1 | Call Option [Member]
Price Risk Derivative Liabilities, at Fair Value	(1)
Commodity Derivatives - Power [Member] | Level 1 | Options - Puts [Member]
Price Risk Derivative Assets, at Fair Value	1
Commodity Derivatives - Power [Member] | Level 2 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	36	23
Price Risk Derivative Liabilities, at Fair Value	(30)	(22)
Commodity Derivatives - Power [Member] | Level 2 | Call Option [Member]
Price Risk Derivative Liabilities, at Fair Value	0
Commodity Derivatives - Power [Member] | Level 2 | Options - Puts [Member]
Price Risk Derivative Assets, at Fair Value	0
Commodity Derivatives - NGLs [Member] | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	476	191
Price Risk Derivative Liabilities, at Fair Value	(522)	(186)
Commodity Derivatives - NGLs [Member] | Level 1 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	476	191
Price Risk Derivative Liabilities, at Fair Value	522	(186)
Commodity Derivatives - NGLs [Member] | Level 2 | Forward Swaps [Member]
Price Risk Derivative Assets, at Fair Value	0	0
Price Risk Derivative Liabilities, at Fair Value	$ 0	$ 0

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